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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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Chapter 3. Forwarding Labeled Packets

What You Will Learn

After completing this chapter, you will be able to do the following:

  • Explain how labeled packets are forwarded

  • Name the reserved MPLS labels and know what they are used for

  • Determine the importance of MPLS MTU in MPLS networks

  • Explain what happens to labeled packets that have TTL expiring

  • Explain what happens with labeled packets that need to be fragmented

Chapter 2, “MPLS Architecture,” focused on what an MPLS label is and how it is used. This chapter specifically focuses on how labeled packets are forwarded. Forwarding labeled packets is quite different from forwarding IP packets. Not only is the IP lookup replaced with a lookup of the label in the label forwarding information base (LFIB), ...

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